Debian 12

Install required packages

Add packages:

sudo apt-get install git autoconf automake libtool make \
   libprotobuf-c-dev protobuf-c-compiler build-essential \
   python3-dev python3-pytest python3-sphinx libjson-c-dev \
   libelf-dev libreadline-dev cmake libcap-dev bison flex \
   pkg-config texinfo gdb libgrpc-dev python3-grpc-tools


The libunwind library is optional but highly recommended, as it improves backtraces printed for crashes and debugging. However, if it is not available for some reason, it can simply be left out without any loss of functionality.

FRR depends on the relatively new libyang library to provide YANG/NETCONF support. Unfortunately, most distributions do not yet offer a libyang package from their repositories. Therefore we offer two options to install this library.

Option 1: Binary Install

The FRR project builds some binary libyang packages.

RPM packages are at our RPM repository.

DEB packages are available as CI artifacts here.


libyang version 2.1.128 or newer is required to build FRR.


The libyang development packages need to be installed in addition to the libyang core package in order to build FRR successfully. Make sure to download and install those from the link above alongside the binary packages.

Depending on your platform, you may also need to install the PCRE development package. Typically this is libpcre2-dev or pcre2-devel.

Option 2: Source Install


Ensure that the libyang build requirements are met before continuing. Usually this entails installing cmake and libpcre2-dev or pcre2-devel.

git clone
cd libyang
git checkout v2.1.128
mkdir build; cd build
cmake --install-prefix /usr \
      -D CMAKE_BUILD_TYPE:String="Release" ..
sudo make install

Get FRR, compile it and install it (from Git)

This assumes you want to build and install FRR from source and not using any packages

Add frr groups and user

sudo addgroup --system --gid 92 frr
sudo addgroup --system --gid 85 frrvty
sudo adduser --system --ingroup frr --home /var/opt/frr/ \
   --gecos "FRR suite" --shell /bin/false frr
sudo usermod -a -G frrvty frr

Download Source, configure and compile it

(You may prefer different options on configure statement. These are just an example.)

git clone frr
cd frr
./configure \
    --sysconfdir=/etc \
    --localstatedir=/var \
    --sbindir=/usr/lib/frr \
    --enable-multipath=64 \
    --enable-user=frr \
    --enable-group=frr \
    --enable-vty-group=frrvty \
    --enable-configfile-mask=0640 \
    --enable-logfile-mask=0640 \
    --enable-fpm \
    --with-pkg-git-version \
make check
sudo make install

For more compile options, see ./configure --help

Create empty FRR configuration files

sudo install -m 640 -o frr -g frr /dev/null /etc/frr/frr.conf
sudo install -m 640 -o frr -g frr tools/etc/frr/daemons /etc/frr/daemons

Edit /etc/frr/daemons and enable the FRR daemons for the protocols you need

Enable IP & IPv6 forwarding

Edit /etc/sysctl.conf and uncomment the following values (ignore the other settings)

# Uncomment the next line to enable packet forwarding for IPv4

# Uncomment the next line to enable packet forwarding for IPv6
#  Enabling this option disables Stateless Address Autoconfiguration
#  based on Router Advertisements for this host

Reboot or use sysctl -p to apply the same config to the running system


Shared library error

If you try and start any of the frrouting daemons you may see the below error due to the frrouting shared library directory not being found:

./zebra: error while loading shared libraries: cannot open
shared object file: No such file or directory

The fix is to add the following line to /etc/ which will continue to reference the library directory after the system reboots. To load the library directory path immediately run the ldconfig command after adding the line to the file eg:

echo include /usr/local/lib >> /etc/